A MAF=Mass Airflow Sensor. VAF=Vane airflow sensor
A MAF measures quantity and density of air coming into the engine. If you unplug the MAF and try starting, the computer will default to factory programming and will calculate air and fuel based on outside air temp, engine temp and pedal position.

First thing to try - open your hood and look near your air filter. In between your air filter and your engine there will be a few electrical plugs. One will be your VAF or MAF (Mass Airflow Sensor). Check to make sure that the electrical plugs are on good. Don't be afraid to give them a little pull, and push them on tightly.
If this does not fix it, check out the video below. It's for a Jeep, but your car may be a similar procedure. It tells you how to clean the sensor.
I put some more technical information about how a MAF sensor works below, in case you are interested.
Warning - technical information ahead!
The mass air flow (MAF) sensor is an air flow meter that measures the amount of air entering the engine. The powertrain control module (PCM) uses the MAF sensor frequency signal in order to provide the correct fuel delivery for a wide range of engine speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle. A large quantity of air entering the engine indicates an acceleration or high load condition. The MAF sensor has an ignition 1 voltage circuit, a ground circuit and a signal circuit. The PCM applies a voltage to the sensor on the signal circuit. The sensor uses the voltage in order to produce a frequency based on inlet air flow through the sensor bore. The frequency varies within a range of around 2,000 Hertz at idle to about 10,000 Hertz at maximum engine load. DTC P0103 sets if the PCM detects a frequency signal higher than the possible range of a properly operating MAF sensor.
car dud

Basically this means that there's a problem with the Mass Air Flow (MAF) sensor or circuit.

You will likely not notice any serious driving problems, but there may be symptoms like a general decrease in power or sluggishness.Causes

A code P0100 may mean one or more of the following:

* The MAF may be disconnected, or a wiring connection may be bad. * The MAF sensor may be faulty.

Possible Solutions

Use an OBD II Reader (or go tou your local parts store and they will for free) and reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:

* Check the Mass Air Flow Sensor wiring/harness is connected properly and that there are no broken / frayed wires. * Unplug and reconnect the MAF wiring harness a few times to clear the contacts. * Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information). * Replace the MAF sensor.

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The Volume Airflow (VAF) / Mass Air Flow (MAF) / Intake Air Temperature (IAT) sensor is located on the air intake housing tube inlet.

Your code is P0102 - Mass Air Flow (MAF) Circuit Low Input, them basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. A more technical description would be that the MAF circuit had lower than expected voltage (air flow). Other MAF sensor circuit DTC trouble codes are P0100, P0101, P0103, and P0104.

Symptoms: You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness.

Causes: A code P0102 may mean that one or more of the following has happened: The MAF may be disconnected, or a wiring connection may be bad The MAF may be dirty or otherwise contaminated (Note: if you use a reusable oiled air filter, be careful not to apply too much oil or that can contaminate the MAF). The MAF sensor may be faulty The vehicle computer may be faulty (very rare)

Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures: Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires. Inspect for any air leaks near the MAF sensor. Take the MAF out and clean it using a spray cleaner such as brake cleaner or electrical contact cleaner. Be gentle with the sensor. Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information) Replace the MAF sensor.

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Related Questions:

run the fault codes
indicates an ambient temp sensor / baro sensor or problems with MAF/VAF sensors
the ambient temp sensor failure will not report correctly to the ECM so the correct air/fuel settings can not be obtained for cold starts
So of not applying the auto choke on the old cars

I don't have a listing for the c code but from the other 2 codes I would be checking around the maf/vaf sensors and the HO2S sensor (replace)
start with checking the wiring and connections to both units